Update webpack-dev-server to the latest version 🚀

[greenkeeper]

The devDependency webpack-dev-server was updated from 3.3.0 to 3.3.1.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for v3.3.1

3.3.1 (2019-04-09)

Bug Fixes

• regression: always get necessary stats for hmr (#1780) (66b04a9)
• regression: host and port can be undefined or null (#1779) (028ceee)
• only add entries after compilers have been created (#1774) (b31cbaa)

Commits

The new version differs by 6 commits.

• 99b78dc chore(release): 3.3.1
• f10fd68 docs: fix changelog (#1783)
• b31cbaa fix: only add entries after compilers have been created (#1774)
• 66b04a9 fix(regression): always get necessary stats for hmr (#1780)
• 028ceee fix(regression): host and port can be undefined or null (#1779)
• f5ea174 docs(contribution): alternative way to test (#1506)

See the full diff

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